#!/usr/bin/env tclsh 
# $Id: test9.tcl 9ce65bed8ef4 2012/08/26 02:14:51 pgurumur $
# Copyright (c) 2012 Prabhu Gurumurthy <pgurumur@gmail.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

# __version__  = "$Revision: 9ce65bed8ef4 $"
# __author__   = "$Author: pgurumur $"
# __modified__ = "$Date: 2012-08-26 02:14:51Z $"

proc isv6address { ip } {

   set octets [split $ip :]
    if {[llength $octets] < 3 || [llength $octets] > 8} {
        return 0
    }
    set ndx 0
    foreach octet $octets {
        incr ndx
        if {[string length $octet] < 1} continue
        if {[regexp {^[a-fA-F\d]{1,4}$} $octet]} continue
        if {$ndx >= [llength $octets] && [IPv4? $octet]} continue
        if {$ndx == 2 && [lindex $octets 0] == 2002 && [IPv4? $octet]} continue
        #"Invalid IPv6 address \"$ip\""
        return 0
    }
    if {[regexp {^:[^:]} $ip]} {
        #"Invalid ipv6 address \"$ip\" (starts with :)"
        return 0
    }
    if {[regexp {[^:]:$} $ip]} {
        # "Invalid IPv6 address \"$ip\" (ends with :)"
        return 0
    }
    if {[regsub -all :: $ip "|" junk] > 1} {
        # "Invalid IPv6 address \"$ip\" (more than one :: pattern)"
        return 0
    }

    if {[regexp {[^:::]} $ip]} {
      return 0
    }
    return 1
}


# puts [isv6address $argv]
set nets [list "::/8" "100::/8" "200::/7" "400::/6" "800::/5"  \
      "1000::/4" "4000::/3" "6000::/3" "8000::/3" "A000::/3"   \
      "C000::/3" "E000::/3" "F000::/5" "F800::/6" "FE00::/9"] 
foreach network $nets {
   puts $network
}
